Quasifree p(K−, K+)Ξ− reaction in nuclear emulsion

doi:10.1016/S0375-9474(98)00596-X

Nuclear Physics A

Volume 644, Issue 4, 28 December 1998, Pages 365-385

https://doi.org/10.1016/S0375-9474(98)00596-X Get rights and content

Abstract

A study of 1.66 $GeV c K^{−}$ beam induced ( $K^{−},K^{+}$ ) reactions in the nuclear emulsion target is presented and 796 ( $K^{−}, K^{+}$ ) reaction vertices ( $p_{K^{+}} ⩾ 1 GeV /c$ ) containing 18 single hyperfragments are identified. There is no clear(spatially separated) double hyperfragment nor twin single hyperfragment in the identified 796 ( $K^{−},K^{+}$ ) reactions. These events are classified and their characteristics are described in detail. In the region $p_{K^{+}} ⩾ 1 GeV /c$ where the quasifree $K^{−} (p) → K^{+} Ξ^{−}$ is the dominant process, the probability of $Ξ^{−}$ emission from the reaction vertex is determined to be 73.9_−4.6^+4.5%. From this value, the mean free path of $Ξ^{−}$ in a nucleus is estimated to be 4.7_−1.0^+1.5 fm for $〈p_{Ξ^{−}} 〉 ∼ 0.6 GeV /c$ by assuming a simple model of uniform nuclear matter.

References (17)

T. Iijima
Nucl. Phys. A
(1992)
S. Aoki
Phys. Lett. B
(1995)
Y. Nara et al.
Nucl. Phys. A
(1997)
B.W. Allardyce
Nucl. Phys. A
(1973)
G. Bohm
Acta Physica Polonica A
(1970)
K.Nakazawa et al., Universal Academy Press, Inc. and INS, University of Tokyo (1995) pp....S. Aoki et al., to be submitted to Nucl. Phys....
Phys. Rev. D
(1996)
S. Aoki
Prog. Theor. Phys.
(1991)

There are more references available in the full text version of this article.

Cited by (39)

Regarding the possibility to observe the LHCb hidden-charm strange pentaquark P<inf>cs</inf>(4459)<sup>0</sup> in antikaon-induced J/ψ meson production on protons and nuclei near the J/ψΛ production threshold
2022, Nuclear Physics A
We study the near-threshold $J / ψ$ meson production on protons and nuclei by considering incoherent direct non-resonant $K^{-} p \to J / ψ Λ$ and two-step resonant $K^{-} p \to P_{c s} {(4459)}^{0} \to J / ψ Λ$ charmonium production processes. We calculate the absolute excitation functions, energy and momentum distributions for the non-resonant, resonant and for the combined (non-resonant plus resonant) production of $J / ψ$ mesons off protons as well as off carbon and tungsten target nuclei at near-threshold incident antikaon energies by considering these elementary production channels as well as by assuming the spin-parity assignment of the hidden-charm resonance $P_{c s} {(4459)}^{0}$ with strangeness as $J^{P} = {(3 / 2)}^{-}$ within six different scenarios for the branching ratio $B r [P_{c s} {(4459)}^{0} \to J / ψ Λ]$ of the decay $P_{c s} {(4459)}^{0} \to J / ψ Λ$ . We show that the combined observables considered reveal definite sensitivity to these scenarios, which means that they may be an important tool to provide further evidence for the existence of the pentaquark $P_{c s} {(4459)}^{0}$ resonance and to get valuable information on its decay rate to the $J / ψ Λ$ final state. Their measurements could be performed in the future at the J-PARC Hadron Experimental Facility.
Medium effects in antikaon-induced Ξ<sup>−</sup> hyperon production on nuclei near threshold
2021, Nuclear Physics A
We study the antikaon-induced inclusive cascade $Ξ^{-}$ hyperon production from ¹²C and ¹⁸⁴W target nuclei near threshold within a nuclear spectral function approach. The approach describes incoherent direct $Ξ^{-}$ hyperon production in elementary $K^{-} p \to K^{+} Ξ^{-}$ and $K^{-} n \to K^{0} Ξ^{-}$ processes as well as takes into account the influence of the scalar nuclear $K^{-}$ , $K^{+}$ , $K^{0}$ , $Ξ^{-}$ and their Coulomb potentials on these processes. We calculate the absolute differential and total cross sections for the production of $Ξ^{-}$ hyperons off these nuclei at laboratory angles ≤ 45^∘ by $K^{-}$ mesons with momenta of 1.0 and 1.3 GeV/c, which are close to the threshold momentum (1.05 GeV/c) for $Ξ^{-}$ hyperon production on the free target nucleon at rest. We also calculate the momentum dependence of the transparency ratio for the ¹⁸⁴W/¹²C combination for $Ξ^{-}$ hyperons at these $K^{-}$ beam momenta. We show that the $Ξ^{-}$ differential and total (absolute and relative) production cross sections at the considered initial momenta reveal a distinct sensitivity to the variations in the scalar $Ξ^{-}$ nuclear potential at saturation density $ρ_{0}$ , studied in the paper, in the low-momentum region of 0.1–0.6 GeV/c. We also demonstrate that for the subthreshold $K^{-}$ meson momentum of 1.0 GeV/c there is, contrary to the case of its above threshold momentum of 1.3 GeV/c, a strong sensitivity of the transparency ratio for $Ξ^{-}$ hyperons to the considered changes in the $Ξ^{-}$ nuclear potential at all outgoing $Ξ^{-}$ momenta as well, which cannot be masked, as in the case of differential and total observables mentioned above, by that associated with the possible changes in the poorly known experimentally $Ξ^{-} N$ inelastic cross section. Therefore, the measurement of these absolute and relative observables in a dedicated experiment at the J-PARC Hadron Experimental Facility will provide valuable information on the $Ξ^{-}$ in-medium properties, which will be complementary to that deduced from the study of the inclusive ( $K^{-}$ , $K^{+}$ ) reactions at incident momenta of 1.6–1.8 GeV/c in the $Ξ^{-}$ bound and quasi-free regions.
Strangeness S = −2 baryon–baryon interaction at next-to-leading order in chiral effective field theory
2016, Nuclear Physics A
The strangeness $S = - 2$ baryon–baryon interaction is studied in chiral effective field theory up to next-to-leading order. The potential at this order consists of contributions from one- and two-pseudoscalar-meson exchange diagrams and from four-baryon contact terms without and with two derivatives. SU(3) flavor symmetry is imposed for constructing the interaction in the $S = - 2$ sector. Specifically, the couplings of the pseudoscalar mesons to the baryons are fixed by SU(3) symmetry and, in general, also the contact terms are related via SU(3) symmetry to those determined in a previous study of the $S = - 1$ hyperon–nucleon interaction. The explicit SU(3) symmetry breaking due to the physical masses of the pseudoscalar mesons (π, K, η) is taken into account. It is argued that the ΞN interaction has to be relatively weak to be in accordance with available experimental constraints. In particular, the published values and upper bounds for the $Ξ^{-} p$ elastic and inelastic cross sections apparently rule out a somewhat stronger attractive ΞN force and, specifically, disfavor any near-threshold deuteron-like bound states in that system.
Strangeness -2 two-baryon systems
2010, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
We derive strangeness −2 baryon–baryon interactions from a chiral constituent quark model including the full set of scalar mesons. The model has been tuned in the strangeness 0 and −1 two-baryon systems, providing parameter free predictions for the strangeness −2 case. We calculate elastic and inelastic NΞ and ΛΛ cross sections which are consistent with the existing experimental data. We also calculate the two-body scattering lengths for the different spin–isospin channels.
Status of the hyperon-nucleon interaction in chiral effective field theory
2022, arXiv
A novel nuclear emulsion detector for measurement of quantum states of ultracold neutrons in the Earth's gravitational field
2022, Journal of Instrumentation

View all citing articles on Scopus

¹: Present address: National Institute of Radiological Sciences, Chiba 263, Japan.

View full text

Quasifree p(K−, K+)Ξ− reaction in nuclear emulsion

Abstract

Nucl. Phys. A

Phys. Lett. B

Nucl. Phys. A

Nucl. Phys. A

Acta Physica Polonica A

Phys. Rev. D

Prog. Theor. Phys.

Quasifree $p(K^{−}, K^{+})$ $Ξ^{−}$ reaction in nuclear emulsion